Bartleby
Bartleby.com: Bulfinch's Mythology: The Age of Fable
Bulfinch's collection of Greek and Roman myths is available here in full text format. A little known feature of this work is its sections on Eastern mythology, Northern mythology and a section on Druid religion.
Open Library of the Internet Archive
Open Library: Age of Fable
This ebook version of Thomas Bulfinch's Age Of Fable has been made available in multiple formats by the Open Library. Editions of the full novel, organized by year of publication, may be accessed here.